piclist 2001\07\22\135610a >
Thread: How to reduce power consumption for battery operated circuits?
www.piclist.com/techref/power/batterys.htm?key=battery
flavicon
face BY : Mike Kendall email (remove spam text)



The difference between the supplied voltage and the regulated voltage is
called the "head" voltage.  It will not necessarily be 2 watts regulator
dissipation for a head voltage of 2volts and drain of 1 watt.  It depends on
the type of regulator.  That is why switching power supplies have such high
efficiency.  I used some Maxim smart charging chips a few years back for
NiCad batteries.  They could withstand a large head voltage because they
were a switching device, similiar to a DC-DC converter.  I'm guessing the
78L05 is linear (they're pretty old and I'd have to look up the specs) and
cannot withstand a high head voltage.  There is certainly some more
efficient ways of doing it if efficiency is worth paying the extra money
for.  I used a very small DC-DC converter to field charge laptops off of
lithium batteries a couple of years ago and the price was not that high.
73,
Mike/ke6cvh

{Original Message removed}
<005901c112ac$e602c2a0$0101a8c0@pavilion> 7bit

See also: www.piclist.com/techref/power/batterys.htm?key=battery
Reply You must be a member of the piclist mailing list (not only a www.piclist.com member) to post to the piclist. This form requires JavaScript and a browser/email client that can handle form mailto: posts.
Subject (change) How to reduce power consumption for battery operated circuits?

month overview.

new search...